Questions about...trojan-downloader.script.generic

In the last 3 days this has come up in my Zone Alarm virus scan, trojan-downloader.script.generic. It was quarintined each time and I then went in and deleted it also. I ran a scan after I deleted the first two times it showed up and the scan was clean, but the next day when I run the scan in the afternoon it is back. I left it in quarintine today and am running another scan now.
Does anyone know anything about this particular trojan/virus or whatever it is? I did a search on Yahoo and I get a couple links that link me to Kapersky, but it doesn't explain what it is or how to make sure it is gone for good. If you've run into it before I'd be interested to hear if you had to do anything beyond a scan to get it off your system, or any other info. you may have on it.
Thanks

I did another scan this morning that Zome Alarm claims looks for root kits and all the good stuff. Supposedly the system is clean. I did Malwarebytes the other day, but will run it again today also. Another question, if all of todays scans show clean do you think I'm clear to do a backup and the backup should be safe? My last back up is a month old which wouldn't kill me, but I would like a more recent. This maybe nuts, but I may get a new drive and put the backup on it and then leave this drive in and go through a couple websites the kids go to play games and see if it is one of those where this came from, or maybe the videos they watch on youtube and Google.
I'm not a violent person usually, but I would love to get the SOB's that make this malware crap and do some bamboo shoots uner the nails as well as some water torture. Maybe a little electricity in the mix too.